Sob brokenly, the treatment being unclear (7)
I believe the answer is:
obscure
'unclear' is the definition.
(I've seen this before)
'sob brokenly the treatment' is the wordplay.
I cannot quite see how this works, but
an anagram of 'sob' is 'obs' which is present in the answer.
'treatment' could be 'cure' (medical treatment) and 'cure' is found in the answer.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'being' is the link.
Can you help me to learn more?
(Other definitions for obscure that I've seen before include "Dim, vague or not well known" , "Indistinct; conceal" , "Gloomy" , "Indistinct or not well-known" , "Dull, opaque" .)